exam Maths Puzzle Numerical Ability

Trader Joe has 3 pounds of walnuts and 6 pounds of almonds sell for $51. Five pounds of walnuts and 4 pounds sell for $55. Find the price of 1 pound of almonds.
I am Totally confused. Trying to help my son. Please help.

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exam Other Question
Solve the formula T = 1/4 s x for the variable s choose the correct answer.

The answer I chose was s = T/4x Western State College is 18 years older than Southern State. Western is also 2 1/2 times as old as Southern State. How old is eac?